[PATCH v2 02/36] soc: fsl: cpm1: qmc: Enable TRNSYNC only when needed

Herve Codina
2024-08-08T07:11:47Z

The TRNSYNC feature is enabled whatever the number of time-slots used.
The feature is needed only when more than one time-slot is used.

Improve the driver enabling TRNSYNC only when it is needed.

Signed-off-by: Herve Codina <herve.codina@bootlin.com>
---
drivers/soc/fsl/qe/qmc.c | 12 +++++++++++-
1 file changed, 11 insertions(+), 1 deletion(-)

diff --git a/drivers/soc/fsl/qe/qmc.c b/drivers/soc/fsl/qe/qmc.c
index bacabf731dcb..916395745850 100644
--- a/drivers/soc/fsl/qe/qmc.c
+++ b/drivers/soc/fsl/qe/qmc.c
@@ -889,6 +889,7 @@ EXPORT_SYMBOL(qmc_chan_stop);
static int qmc_setup_chan_trnsync(struct qmc *qmc, struct qmc_chan *chan)
{
struct tsa_serial_info info;
+ unsigned int w_rx, w_tx;
u16 first_rx, last_tx;
u16 trnsync;
int ret;
@@ -898,6 +899,14 @@ static int qmc_setup_chan_trnsync(struct qmc *qmc, struct qmc_chan *chan)
if (ret)
return ret;

+ w_rx = hweight64(chan->rx_ts_mask);
+ w_tx = hweight64(chan->tx_ts_mask);
+ if (w_rx <= 1 && w_tx <= 1) {
+ dev_dbg(qmc->dev, "only one or zero ts -> disable trnsync\n");
+ qmc_clrbits16(chan->s_param + QMC_SPE_CHAMR, QMC_SPE_CHAMR_TRANSP_SYNC);
+ return 0;
+ }
+
/* Find the first Rx TS allocated to the channel */
first_rx = chan->rx_ts_mask ? __ffs64(chan->rx_ts_mask) + 1 : 0;

@@ -911,6 +920,7 @@ static int qmc_setup_chan_trnsync(struct qmc *qmc, struct qmc_chan *chan)
trnsync |= QMC_SPE_TRNSYNC_TX((last_tx % info.nb_tx_ts) * 2);

qmc_write16(chan->s_param + QMC_SPE_TRNSYNC, trnsync);
+ qmc_setbits16(chan->s_param + QMC_SPE_CHAMR, QMC_SPE_CHAMR_TRANSP_SYNC);

dev_dbg(qmc->dev, "chan %u: trnsync=0x%04x, rx %u/%u 0x%llx, tx %u/%u 0x%llx\n",
chan->id, trnsync,
@@ -1378,7 +1388,7 @@ static int qmc_setup_chan(struct qmc *qmc, struct qmc_chan *chan)
if (chan->mode == QMC_TRANSPARENT) {
qmc_write32(chan->s_param + QMC_SPE_ZDSTATE, 0x18000080);
qmc_write16(chan->s_param + QMC_SPE_TMRBLR, 60);
- val = QMC_SPE_CHAMR_MODE_TRANSP | QMC_SPE_CHAMR_TRANSP_SYNC;
+ val = QMC_SPE_CHAMR_MODE_TRANSP;
if (chan->is_reverse_data)
val |= QMC_SPE_CHAMR_TRANSP_RD;
qmc_write16(chan->s_param + QMC_SPE_CHAMR, val);
--
2.45.0